Solar thermoelectric synergistic coupling hydrogen production and heating system

Abstract

The utility model discloses a solar thermoelectric synergistic coupling hydrogen production and heating system, and relates to the technical field of solar photovoltaic electrolytic hydrogen production. The system comprises a solar cogeneration assembly, a circulating water pump, a water pipe, a first heat collection water tank, a water source heat pump, a second heat collection water tank, a heat exchanger and an electrolytic cell. The solar combined heat and power assembly is connected with the first heat collection water tank through the circulating water pump. The solar combined heat and power assembly is further connected with the second heat collection water tank through the water source heat pump; the first heat collection water tank and the second heat collection water tank are connected with the heat exchanger; the heat exchanger is connected with the electrolyzer; and the circulating water pump is arranged on the water pipe. The utility model can effectively reduce the starting heating electricity consumption of the electrolytic bath and improve the solar energy utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of solar photovoltaic electrolysis hydrogen production technology, and more specifically to a solar thermoelectric coupled hydrogen production and heating system. Background Technology

[0002] Currently, photovoltaic power generation faces issues such as resource cyclicality and security instability, which can hinder the normal dispatch of the power grid and threaten its security and stability. Direct grid connection of photovoltaic power generation is also difficult.

[0003] Photovoltaic hydrogen production can effectively solve the problem of solar energy storage, but cost issues severely restrict the development of the green hydrogen industry. On the one hand, in western regions rich in photovoltaic resources, especially in desert areas suitable for large-scale photovoltaic power plants, the actual power generation efficiency of ordinary photovoltaic cell modules is greatly affected by cell temperature. When solar irradiance is good, the cell temperature rises significantly, and the actual power generation efficiency drops sharply. On the other hand, since the operating temperature of various water electrolysis hydrogen production methods is 50-90℃, photovoltaic hydrogen production is a discontinuous process (electrolysis is stopped at night or when there is no sunshine), the electrolyte temperature will inevitably drop. When restarting, additional electrical energy is required to heat the electrolyte, which will inevitably lead to a huge waste of electrical energy.

[0004] In the AEM (Alternating Electrolytic Cell) water electrolysis process for hydrogen production, a portion of the electrical energy is converted into heat. This heat is ultimately carried away by cooling water or dissipated into the surrounding environment, reducing the system's thermal efficiency. Simultaneously, renewable energy power generation is intermittent, fluctuating, and random due to natural conditions, resulting in unstable power supply to the AEM electrolyzer. When the renewable energy power generation is low, the electrolysis power of the electrolyzer decreases, and the actual heat dissipation of the electrolyzer exceeds its heat generation, causing the electrolyzer temperature to drop below the optimal operating temperature for electrolysis. This ultimately leads to a significant reduction in water electrolysis efficiency and rate, particularly noticeable during isolated photovoltaic grid operation. Furthermore, electrolyzers frequently require shutdown for maintenance due to malfunctions. The shorter the startup time, the less hydrogen production loss in the system. If the electrolyzer starts in a hot standby state, its startup time will be significantly shortened, far less than the startup time under cold conditions. However, currently, there are no effective insulation measures for electrolyzers to ensure they are in a hot standby state during startup, resulting in a relatively long startup time and high energy consumption during the startup phase.

[0005] Therefore, in solar photovoltaic hydrogen production systems (especially isolated grid systems), how to maintain the water in the electrolyzer at low cost during nighttime and maintenance periods, thereby reducing heating power consumption and start-up time, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the present invention provides a solar-thermal-electric coupled hydrogen production and heating system, which can effectively reduce the power consumption for starting up the electrolyzer and improve the utilization rate of solar energy.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A solar-thermal-electric coupled hydrogen production and heating system includes: a solar-thermal-electric cogeneration module, a circulating water pump, water pipes, a first hot water tank, a water source heat pump, a second hot water tank, a heat exchanger, and an electrolytic cell;

[0009] The solar combined heat and power (CHP) module is connected to the first hot water tank via a circulating water pump;

[0010] The solar combined heat and power (CHP) unit is also connected to a second hot water tank via a water source heat pump;

[0011] Both the first and second hot water tanks are connected to the heat exchanger.

[0012] The heat exchanger is connected to the electrolytic cell;

[0013] The circulating water pump is installed on the water pipe.

[0014] Preferably, the solar combined heat and power (CHP) assembly includes a hot water collection pipe inlet, a photovoltaic cell, and a hot water collection pipe outlet connected in sequence.

[0015] Preferably, the solar combined heat and power module further includes a flat plate heat pipe located on the back of the photovoltaic cell.

[0016] Preferably, the flat plate heat pipe has multiple parallel, non-interconnected, and independently operating micro heat pipes inside.

[0017] Preferably, the hydraulic diameter of the micro heat pipe is 1-2 mm, and the internal phase change working fluid is a non-conductive medium.

[0018] As can be seen from the above technical solution, compared with the prior art, this utility model provides a solar-thermal-electric co-generation hydrogen production and heating system; some photovoltaic modules in the photovoltaic power station use solar-thermal-electric cogeneration modules, which generate electricity and hot water. Waste heat from the backsheet of the photovoltaic cells is collected and stored during the day, and the water inside the electrolyzer is heated at night or during maintenance periods when the electrolyzer needs insulation. Compared with conventional methods, this can effectively reduce the power consumption for starting up the electrolyzer and improve the utilization rate of solar energy. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a structural schematic diagram of the present invention;

[0021] Figure 2 A structural diagram of the solar combined heat and power (CHP) module provided by this utility model;

[0022] Figure 3 Detailed drawing of the solar combined heat and power (CHP) module provided by this utility model;

[0023] The components include: 1. Solar combined heat and power (CHP) components; 2. Circulating water pump; 3. Water pipes; 4. First hot water tank; 5. Water source heat pump; 6. Second hot water tank; 7. Heat exchanger; and 8. Electrolytic cell. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] See Figure 1 This utility model discloses a solar-thermal-electric coupled hydrogen production and heating system, including: a solar-thermal-electric cogeneration component 1, a circulating water pump 2, a water pipe 3, a first hot water tank 4, a water source heat pump 5, a second hot water tank 6, a heat exchanger 7, and an electrolytic cell 8.

[0026] The solar combined heat and power (CHP) module 1 is connected to the first hot water tank 4 via a circulating water pump 2;

[0027] The solar combined heat and power unit 1 is also connected to the second hot water tank 6 via a water source heat pump 5;

[0028] Both the first hot water tank 4 and the second hot water tank 6 are connected to the heat exchanger 7;

[0029] Heat exchanger 7 is connected to electrolytic cell 8;

[0030] The circulating water pump 2 is installed on the water pipe 3.

[0031] For details, see Figure 2-3The solar combined heat and power (CHP) assembly 1 includes a hot water collection pipe inlet 1-1, a photovoltaic cell, and a hot water collection pipe outlet 1-2 connected in sequence.

[0032] Specifically, the solar combined heat and power module 1 also includes flat plate heat pipes 1-3, which are located on the back of the photovoltaic cells.

[0033] Specifically, the flat plate heat pipe 1-3 has multiple parallel, non-interconnected, and independently operating micro heat pipes inside.

[0034] Specifically, the hydraulic diameter of the micro heat pipe is 1-2 mm, and the internal phase change working fluid is a non-conductive medium.

[0035] The specific working process of this utility model is as follows:

[0036] When there is solar radiation during the day, the solar cogeneration module 1 starts to work. While the solar cogeneration module 1 is generating electricity, when there is a temperature difference between the module back plate and the first hot water tank 4, the circulating water pump 2 starts to work to collect the waste heat of the module back plate.

[0037] When the ambient temperature is high or the solar radiation is strong, the solar combined heat and power unit 1 can heat the water to above 50°C during the daytime, and the heat is stored in the first hot water tank 4.

[0038] When the ambient temperature is low or the solar radiation is weak, the solar combined heat and power module 1 provides a low-temperature heat source, which enters the evaporator side of the water source heat pump 5. After the compressor of the water source heat pump 5 does work, high-temperature hot water above 65°C is generated on the condenser side and stored in the second hot water tank 6.

[0039] After the photovoltaic power generation hydrogen production system is shut down at night, the water temperature in the electrolyzer continues to drop. The water in the electrolyzer 8 is heated from the first hot water tank 4 or the second hot water tank 6 through the heat exchanger 7 to maintain a constant temperature, so that it can be quickly started up the next day.

[0040] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solar-thermal cogeneration coupled hydrogen production and heating system, characterized in that, The utility model relates to a solar heat and power cogeneration assembly (1), circulating water pump (2), water pipe (3), first heat collecting water tank (4), water source heat pump (5), second heat collecting water tank (6), heat exchanger (7) and electrolytic cell (8) are included. The solar heat and power cogeneration assembly (1) is connected with the first heat collecting water tank (4) through the circulating water pump (2). The solar heat and power cogeneration assembly (1) is also connected with the second heat collecting water tank (6) through the water source heat pump (5). The first heat collecting water tank (4) and the second heat collecting water tank (6) are connected with the heat exchanger (7). The heat exchanger (7) is connected with the electrolytic cell (8). The circulating water pump (2) is arranged on the water pipe (3). The solar heat and power cogeneration assembly (1) comprises a heat collecting water pipe inlet (1-1), a photovoltaic cell and a heat collecting water pipe outlet (1-2) connected in sequence.

2. The solar-thermal co-coupled system for hydrogen production and heating according to claim 1, wherein, The solar heat and power cogeneration assembly (1) further comprises a flat heat pipe (1-3) located at the back of the photovoltaic cell.

3. The solar-thermal-electricity co-coupled hydrogen production and heating system of claim 2, wherein, The flat heat pipe (1-3) has a plurality of parallelly arranged micro heat pipes which are not connected with each other and independently run.

4. The solar-thermal-electricity co-coupled hydrogen production and heating system of claim 3, wherein, The hydraulic diameter of the micro heat pipe is 1-2mm, and the internal phase change working medium is a non-conductive medium.

5. The solar-thermal co-coupled system for hydrogen production and heating according to claim 4, wherein, ​

Images